examples/zyg.sh

   1 #!/bin/sh
   2 # Run z-machine interpreter, allowing the user to save their game in a
   3 # directory specific to their client cert.
   4
   5 var=/var/gemini/zyg/
   6
   7 function readline {
   8     echo -n '<' >&3
   9     read line
  10     ret=$?
  11     echo -n '>' >&3
  12     echo "$line"
  13     return $ret
  14 }
  15
  16 [ -n "$TLS_CLIENT_HASH" ] || exit 1
  17
  18 if [ -n "$SPAWN_PARAMETER" ]; then
  19     sanitised="$(tr -dc [:alnum:]_ <<< "$SPAWN_PARAMETER")"
  20     gamefile="$var/games/$sanitised"
  21     if ! ( [ -n "$sanitised" ] && [ -e "$gamefile" ] ); then
  22         echo "Unknown game: $sanitised"
  23         exit 1
  24     fi
  25 else
  26     echo "Choose your poison:"
  27     ls -1 "$var/games/"
  28
  29     while input="$(readline)"; do
  30         sanitised="$(tr -dc [:alnum:]_ <<< "$input")"
  31         gamefile="$var/games/$sanitised"
  32         if [ -n "$sanitised" ] && [ -e "$gamefile" ]; then
  33             break;
  34         fi
  35         echo "Please enter one of the listed games"
  36     done
  37 fi
  38
  39 echo "Starting $sanitised. Savefiles will be preserved."
  40 echo
  41
  42 savesdir="$var/$TLS_CLIENT_HASH/$sanitised"
  43
  44 mkdir -p "$savesdir" || exit 1
  45 cd "$savesdir" || exit 1
  46
  47 # Impose some limits to reduce potential for abuse
  48 ulimit -t 1200
  49 ulimit -f 5000
  50 ulimit -v 20000
  51
  52 if [[ "$(realpath "$gamefile")" =~ \.gblorb$ ]]; then
  53     stdbuf -i0 -o0 cheapgit-zyg "$gamefile"
  54 else
  55     # using the z-machine interpreter infuse, which has a nice stdio interface:
  56     # https://gitlab.com/monkeymind/infuse
  57     # Lightly hacked to improve output and to write to stderr when prompting
  58     stdbuf -i0 -o0 infuse "$gamefile"
  59
  60     # Previous attempt: using dfrotz, but it has some problems.
  61     #dfrotz -m -Z0 -R. "$gamefile"
  62 fi